Anet A8 Extruder Mounted Filament Guide / Runout Sensor (Endstop)

This is intended to be used with Octopi and https://github.com/kontakt/Octoprint-Filament-Reloaded at least on my setup.

But I'm positive it could also be wired to a RAMPS, but don't ask me! :P

I had a heck of a time getting the optical one to work consistently, so I switched to a mechanical endstop switch. If you are looking for an optical sensor mount I have one here https://www.thingiverse.com/thing:2452990